Showing posts with label computer info. Show all posts
Showing posts with label computer info. Show all posts
Thursday, April 21, 2011
Have you ever found yourself at a friend’s house, wishing you could access the music on your computer? Or maybe you wish it was easier to connect to your VNC share from web cafes or your office? Maybe you’ve even tried writing down your IP address before leaving home specifically so you could connect?
The main problem with that approach is that most ISPs change your IP on a regular basis. Some ISPs will give you a static IP – typically for a monthly premium – and such an IP can give you access from anywhere.
Alternatively, you can use DynDNS. This company specializes in solving exactly the problem you’re thinking of with a free Dynamic DNS setup – giving you a web address that will consistently point to your computer, even when your ISP changes your IP.
And if you just want one URL, it’s a free service.
How Free Dynamic DNS Works
Here’s the deal: you get an account at DynDNS, which provides you with a free URL. Then you set up your home network to inform DynDNS of your current IP on a regular basis – this can be done using the firmware in your router – most routers support such a free Dynamic DNS by default – or by installing free Dynamic DNS software on a computer on your network designed for this purpose.
Once everything is set up you’ll be able to access your home network from anywhere, using the URL provided to you by DynDNS.
Getting Started
Setting up DynDNS is easy. All you need to do is create a free Dynamic DNS account at their website, selecting a subdomain from their wide variety of domains.
Being the Linux enthusiast that I am, I choose “homelinux.com,” but the choice is largely aesthetic – just pick something you can remember easily.
Once your account is set up you’ll have a username and password you can use in order to use the service. What you need to do now is set up your home network to regularly report your IP to DynDNS.
Configure Your Router
The simplest way to do this is to configure your router to do so. How to do this varies depending on your brand and model of router, but for the most part the process goes something like this:
1. Type your router’s internal IP address into a web browser and hit “enter.” This will bring up your router’s web-based configuration.
2. Find the dynamic DNS option, and enter your settings.
On my Linksys router, this configuration looks something like this:
Typically all your router needs is your DynDNS username and password, so enter those and you’re good to go.
3. Apply your changes. This may shut down your router temporarily, but just start it up again.
Obviously configuring your router is the simplest way to do this, but if don’t have a router, or if your router doesn’t support DynDNS directly, you can download software here that can report your current IP to DynDNS.
Port Forwarding
Okay, so you’ve got your fancy URL now but attempting to use it to connect to your computer from elsewhere won’t help much unless you set up your router properly.
Your router essentially acts as a firewall, as all incoming requests are directed to it. Unless your router is specifically aware of what requests are going to come in, it will continue to block everything you try to connect to from outside your network. That’s where the magic of port forwarding comes in.
If you don’t know what a port is, the best analogy is that of an apartment number: if your IP address is like your street address, your port number is like your apartment number.
If your friend knows your street address, but not your apartment address, they’re not going to have much luck finding you. In the same way, if you’re connecting to your computer from somewhere else on the Internet you can’t just type your IP address: you need to specify which port you’re trying to access.
For example, popular remote-desktop software VNC uses 5900 as it’s default port. If I want to connect to one of my computers using VNC from outside my network – for example, from a web cafe – I need to make sure my router knows to forward all incoming requests to port 5900 to the computer I want to control.
Setting this up isn’t that difficult: it’s almost always possible from your router’s web-based configuration. On my Netgear router the setting screen looks something like this:
In the above example I’m setting up VNC to forward to my media center computer. Like setting up your router with DynDNS, be sure to apply your settings after you’ve added your new configuration.
If you’re not sure what port a particular program uses, you can either search that program’s configuration for the option to change it or search the program’s documentation.
There’s still more: the firewall on your computer may also block incoming requests, unless you set up your firewall to allow for connections on that port. Check your firewall’s documentation if you’re not sure how to do this.
Uses
VNC’s only one example of a program you can use this method to set up, of course. If you set up an FTP server on your computer you’ll be able to access your documents from everywhere. You could use this method to connect to any program’s WebUI, including the bittorrent client Deluge.
Basically anything you can connect to from within your network can be made to work Internet-wide with DynDNS, if you’re willing to set it up.
Testing
Testing your setup is easy: call a friend and see if they can connect to your computer using the programs you’ve set up.
Alternatively you could use a proxy service to connect to your computer. If you can connect through a proxy, after all, you’re connecting from outside your network.
Configure Modem
Some ISPs – such as Qwest in the Western United States – provide modems that are intended to function as wireless routers as well as modems. If you have such a modem you might find that DynDNS doesn’t work for you. If this is the case you need to configure your modem to forward all requests to your router, from where port forwarding can properly happen.
If you think this is happening to you, check out the website of your ISP or give them a call. More likely than not they’ll be able to help you.
Conclusion
I use DynDNS to connect to my home network from elsewhere, and it works like a charm. Sure, setting it all up requires you learn some networking skills in the process, but if you’re reading MakeUseOf you probably love learning stuff anyway. And you never know when such skills might come in handy.
What about you guys? Do you use DynDNS or a similar service to connect to your computer remotely? Do you have any questions about setting this all up? As always, feel free to discuss everything in the comments below.
Thursday, October 14, 2010
technical abbrevations!
Posted by Unknown | Thursday, October 14, 2010 | Category:
computer info
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- CLR: Common Language Runtime
- DBMS: Database Management System
- RDBMS: Relational Database Management System
- OSI : Open System Interconnection
- TCP : Transmission control Protocol
- IP : Internet Protocol
- DLL : Data Link Layer
- VB : Visual Basic
- GUI : Graphical User Interface
- PC: Personal Computer
- HTML : Hypertext Markup Language
- XML : Extended Markup Language
- ASP : Active Server Pages
- ADO : Active Data Objects
- URL : Universal Resourse Locator
- UDP : User Datagram Protocol
- MDI : Multiple Document Interface
- JIT : Just In Time
- COM : Component Object Model
- NT : New Technology
- RAM : Rendom Access Memory
- ROM : Read Only Memory
- CD : Compact Disc
- DVD : Digital Versatile Disc
- DNS : Domain Name Service
- ORB: Object Relational Bridge
- COBRA: Common Object Request Broker Architechture
- J2EE: Java 2 Enterprise Edition
- J2SE: Java 2 Standard Edition
- SQL: Structured Query Language
- LDAP: LightWeight Directory Access Protocol
- NTFS: New Technology File System
- DAO: Data Access Objects
- JDO: Java Data Objects
- JSP: Java Server Pages
- ICMP: Internet Controlled Message Protocol
- IGMP: Internet Group Message Protocol
- PHP: (Recursive acronyme)PHP Hypertext Preprocessor
- EJB: Enterprise Java BEans http: hyper text transfer protocol
- ftp: file transfer protocol
- smtp: simple mail transfer protocol
- ERP : Enterprise Resourse Planning
- CRM : Customer Relationship Management
- UDP : User Datagram Protocol
- URI : Universal Resource Indicator
- IE : Internet Explorer
- IIS : Internet Information Server
- FIFO : First In First Out
- LIFO : Last In First Out
- SNMP: Simple Network Managment Protocol
- FTP: File Transfer Protocol
- PING: Packet Internet Gopher
- POP: Post Office Protocol
- IMAP: Internet Message Application Protocol
- GIF: Graphic Interchange Format
- PNG: Portable network Graphics
- MPEG: Motion Pictures Experts Group
- OOP : object Oriented Programming
- NTD : No Touch Deployment
- IL : Intermediate Language
- GAC : Global Assembly Cache
- DLL : Dynamic Link Library
- ANSI : American National Standards Institute
- DHTML : Dymamic Hypertext Markup Language
- GDI : Graphical Device Interface
- GUID : Globally Unique Identifier
- RFC : Request For Comment
- SMPS: Switch Mode Power Supply
- ALU: Arithmetic Logic Unit
- API: Application Programming Interface
- JVM: Java Virtual Machine
- MVC: Model View Controller
- DSP: Digital Signal Processing
- ODBC: Open Database Connectivity
- AWT: Abstract Window ToolKit
- TDD: Test Driven Development
- DOM : Document Object Model
- SDI : Single Document Interface
- SOAP : Simple Object Access Protocol
- SSL : Secure Socket Layer
- UPN : User Principal Name
- DML : Data Manipulation Language
- DDL : Data Defination Language ASP-Active Server Pages
- DHTML-Dynamic Hyper Text Markup Lnguage
- CSS-Cascading Style Sheet
- ORDBMS-Object-Oriented Relational Database Managament System
- ADT Application Data Types
- ADU Automatic Dialing Unit
- AE Above or Equal
- AEB Analog Expansion Bus [Dialogic]
- AF Auxiliary carry Flag
- AFA Accelerated File Access
- AFC Automatic Font Change + Automatic Frequency Control
- AFD Automatic File Distribution
- AFII Association for Font Information Interchange
- AFIRM Automated Fingerprint Image Reporting and Match
- AFIS Automated Fingerprint Identification System
- .AFM Adobe Font Metrics (file name extension)
- [Adobe Systems]
- AFP Appletalk Filing Protocol [Macintosh]
- AFS Andrew File System (protocols)
- AFTP Anonymous File Transfer Protocol
- AGC Automatic Gain Control
- AGRAS Antiglare-Antireflective-Antistatic
- AGU Address-Generation Unit
- AI Analog Input + Artificial Intelligence
- AIA Applications Integration Architecture [DEC]
- AIC AIXwindows Interface Composer [IBM]
- AIF Audio Interchange Format
- AIIM Association for Information and Image Management
- AIN Advanced Intelligent Network [Bell Atlantic]
- AIS Automated Identification System [NCIC]
- AISB Association of Imaging Service Bureaus
- AISP Association of Information Systems Professionals
- AIX Advanced Interactive Executive [IBM]
- ALC Arithmetic and Logic Circuits +
- Automatic Level Control
- ALE Address Latch Enable
- ALGOL Algorithmic Oriented Language (see IAL)
- ALIBI Adaptive Location of Internetworked Bases
- of Information
- ALINK Active Link [HTML]
- ALIWEB Archie Like Indexing in the Web [Internet]
- ALN Asynchronous Learning Network
- ALR Advanced Logic Research, Inc.
- ALT Alternate (mode)
- ALT. Alternate lifestyle [USENET Newsgroup Category]
- ALU Arithmetic Logic Unit
- AMANDDA Automated Messaging and Directory Assistance
- AMD Active Matrix Display +
- Advanced Micro Devices, Inc.
- AMI American Megatrends, Inc.
- AMMA Advanced Memory Management Architecture
- [Everex Systems]
- AMPS Advanced Mobile Phone Service
- ANCOVA Analysis of Covariance
- ANDF Architecture-Neutral Distribution Format
- ANI Automatic Number Identification
- .ANI Animated Cursor (file name extension) [Microsoft]
- ANN Artificial Neural Network
- .ANN Annotations (file name extension) [IBM]
- ANOVA Analysis Of Variance
- ANSI American National Standards Institute
- AO Analog Output
- AOCE Apple Open Collaboration Environment
- AOE Application Operating Environment [AT&T]
- AOL America Online
- AOS Add Or Subtract
- ISP: internet service provider
- JSP: Java Server Pages
- AA Auto Answer
- AAA Authentication, Authorization and Accounting
- AAB All-to-All Broadcast
- AAC Advanced Audio Coding
- AAL Asynchronous Transfer Mode Adaption Layer
- AAM Automatic Acoustic Management
- AAP Applications Access Point [DEC]
- AARP AppleTalk Address Resolution Protocol
- AAS All-to-All Scatter
- AASP ASCII Asynchronous Support Package
- AAT Average Access Time
- AATP Authorized Academic Training Program [Microsoft]
- .ABA Address Book Archive (file name extension) [Palm]
- ABC * Atanasoff-Berry Computer (First digital calculating machine that used vacuum tubes)
- ABEND Abnormal End
- ABI Application Binary Interface
- ABIOS Advanced BIOS
- ABIST Automatic Built-In Self-Test [IBM]
- ABLE Adaptive Battery Life Extender
- ABM Asynchronous Balanced Mode
- ABR Available Bit Rate
- ABRD Automatic Baud Rate Detection
- ABRS Automated Book Request System [British Library]
- ABS Address Book Synchronization [IBM] + Absolute ABT Abort
- ABTS ASCII Block Terminal Services
- AC Autocheck + Automatic Computer + Alternating Current
- ACAP Application Configuration Access Protocol
- ACC Accumulator
- ACCMAIL Accessing the Internet Via Email
- ACD Automatic Call Distribution
- ACDI Asynchronous Communications Device Interface
- ACE Access Control Encryption/Entry + Adobe Certified Expert + Advanced Computing Environment [SCO] + Adverse Channel Enhancements [Microcom] + * Automatic Computing Engine
- ACF Access Control Field + Advanced Communications Function
- ACH Automated Clearing House
- ACIAS Automated Calibration Interval Analysis System
- ACIS American Committee for Interoperable Systems
- ACK Acknowledgment
- ACL Access Control List + Asynchronous Connection-Less (link)
- ACM Association for Computing Machinery
- Audio Compression Manager [Microsoft]
- ACMS Application Control Management System
- ACP Ancillary Control Program + Auxiliary Control Process
- ACPI Advanced Configuration and Power Interface
- ACR Allowed Cell Rate
- ACROSS Automated Cargo Release and Operations
- Service System
- ACS Access + Access Control Set + Access Control System +
- * Advanced Computer System [IBM] +
- Anti Curl System + Asynchronous Communication Server
- ACSS Audio Cascading Style Sheets
- ACTLU Active Logical Unit
- ACTPU Active Physical Unit
- ACTS Automated Computer Time Service
- ACTT Advanced Communication and Timekeeping Technology [Seiko]
- ACU Automatic Calling Unit
- ACVC Ada Compiler Validation Capacity
- A/D Analog to Digital
- ADA Automatic Data Acquisitions +
- (Programming Language named after Augusta Ada Lovelace)
- ADB Apple Desktop Bus
- ADC Adaptive Data Compression (protocol) [Hayes] +
- Add with Carry + Analog to Digital Converter
- ADCCP Advanced Data Communication Control Procedures/Protocol
- ADD Automatic Document Detection [WordPerfect]
- ADF Automatic Document Feeder +
- Automatically Defined Function
- .ADF Adapter Description File (file name extension)
- ADI AutoCad/AutoDesk Device Interface (driver)
- ADL Address Data Latch
- ADLAT Adaptive Lattice Filter
- ADLC Adaptive Lossless Data Compression [IBM] +
- Asynchronous Data Link Control
- ADMACS Apple Document Management And Conrol System
- ADMD Administrative Management Domain [X.400]
- ADO ActiveX Data Objects
- ADP AOLserver Dynamic Pages + Automatic Data Processing
- ADPCM Adaptive Differential Pulse Code Modulation
- ADR Address
- ADS Application Development Solutions [AT&T] +
- Application Development System +
- Automatic Distribution System
- ADSC Address Status Changed +
- Adobe Document Structuring Conventions
- ADSI Active Directory Service Interface [Microsoft] +
- Analog Display Services Interface
- ADSL (See DSL)
- ADSP AppleTalk Datastream Protocol
- ADSR Attack, Decay, Sustain, Release
- ADT Abstract Data Type + Application Data Types
- ADU Automatic Dialing Unit
- AE Above or Equal
- AEB Analog Expansion Bus [Dialogic]
- AEC Architecture, Engineering, Construction
- AEM Asynchronous Event Mechanism
- .AERO Aviation Industry (Domain Name) [Internet]
- AES Advanced Encryption Standard
- AESA ATM End System Address
- AF Auxiliary carry Flag
- AFA Accelerated File Access
- AFC Antiferro-Magnetically Coupled (media) [IBM] +
- Automatic Font Change + Automatic Frequency Control
- AFD Automatic File Distribution
- AFDW Active Framework for Data Warehousing [Microsoft]
- AFI Authority and Format Identifier
- AFII Association for Font Information Interchange
- AFIRM Automated Fingerprint Image Reporting and Match
- AFIS Automated Fingerprint Identification System
- .AFM Adobe Font Metrics (file name extension) [Adobe Systems]
- AFP Advanced Function Presentation [IBM] +
- Advanced Function Printing +
- Appletalk Filing Protocol [Macintosh]
- AFS Andrew File System (protocols)
- AFTP Advanced/Anonymous File Transfer Protocol
- AGA Advanced Graphics Adapter
- AGC Automatic Gain Control
- AGP Accelerated/Advanced Graphics Port
- AGRAS Antiglare-Antireflective-Antistatic
- AGU Address-Generation Unit
- AH Authentication Header (protocol)
- AHS Automated Highway Systems
- AI Analog Input + Artificial Intelligence
- AIA Applications Integration Architecture [DEC]
- AIC AIXwindows Interface Composer [IBM]
- AIFF Audio Interchange File Format
- AIIM Association for Information and Image Management
- AIM AOL Instant Messenger
- AIN Advanced Intelligent Network [Bell Atlantic]
- AIP Application Infrastruture Provider
- AIR Architecture Implementation Review
- AIS Automated Identification System [NCIC] +
- Automated Information Systems
- AISB Association of Imaging Service Bureaus
- AISP Association of Information Systems Professionals
- AIT Advanced Intelligent Tape (drive) [Sony]
- AIX Advanced Interactive Executive [IBM]
- ALAT Advanced Load Address Table
- ALC Arithmetic and Logic Circuits +
- Automatic Level Control
- ALE Address Latch Enable +
- Application Linking and Embedding
- ALGOL Algorithmic Oriented Language (see IAL)
- ALIBI Adaptive Location of Internetworked Bases
- of Information
- ALICE Artificial Linguistic Internet Computer Entity
- ALINK Active Link [HTML]
- ALIWEB Archie Like Indexing in the Web [Internet]
- ALN Asynchronous Learning Network
- ALP Automatic Language Processing
- ALR Advanced Logic Research, Inc.
- ALT Alternate (mode)
- ALT. Alternate lifestyle [USENET Newsgroup Category]
- ALU Arithmetic Logic Unit
- AMA Automatic Message Accounting
- AMANDDA Automated Messaging and Directory Assistance
- AMASS Archival Management and Storage System
- AMD Active Matrix Display + Advanced Micro Devices, Inc.
- AMI Alternate Mark Inversion + American Megatrends, Inc. +
- Application Messaging Interface
- AMMA Advanced Memory Management Architecture
- [Everex Systems]
- AMPS Advanced Mobile Phone Service
- AMR Audio Modem Riser
- ANCOVA Analysis of Covariance
- ANDF Architecture-Neutral Distribution Format
- ANI Automatic Number Identification
- .ANI Animated Cursor (file name extension) [Microsoft]
- ANN Artificial Neural Network
- .ANN Annotations (file name extension) [IBM]
- ANOVA Analysis Of Variance
- ANSI American National Standards Institute
- ANX Automotive Network Exchange [Chrysler/Ford/General Motors]
- AO Analog Output
- AOCE Apple Open Collaboration Environment
- AO/DI Always On/Dynamic ISDN
- AOE Application Operating Environment [AT&T]
- AOL America Online
- AOS Add Or Subtract
- AP Adjunct Processor + Application Processor
- A/P Accounts Payable
- APA Adaptive Packet Assembly + All Points Addressable + Arithmetic Processing Accelerator
- APAR Authorized Program Analysis Report [IBM]
- APAREN Address Parity Enable [IBM]
- APCUG Association of PC User Groups
- APDU Application Protocol Data Units
- API Application Program Interface
- APIC Advanced Programmable Interrupt Controller (bus) [Intel]
- APIS Advanced Passenger Information System
- APL * A Programming Language (Mathematics)
- APM Advanced Power Management [IBM]
- APNIC Asia-Pacific Network Information Center [Internet]
- APOP Authenticated Post Office Protocol
- .APP Application (file name extension) [R:Base]
- APPC Advanced Program-to-Program Communications [IBM]
- APPI Advanced Peer-to-Peer Internetworking
- APPLETS Applications
- APPN Advanced Peer-to-Peer Networking [IBM]
- APPS Applications
- APR Annual Percentage Rate
- APRP Adaptive Pattern Recognition Processing
- APS Advanced Photo System + Advanced Printing Service [IBM] Asynchronous Protocol Specification
- APSE ADA Programming Support Environment
- APT Address Pass Through + Advanced Parallel Technology + Automatically Programmed Tools
- A/R Accounts Receivable
- ARA AppleTalk Remote Access
- ARAG Antireflective-Antiglare
- ARAS Antireflective-Antistatic
- .ARC Archive (file name extension)
- ARCA Advanced RISC Computing Architecture
- ARCnet Attached Resource Computer Network
- .ARJ Compressed File (file name extension) [Jung]
- ARL Adjusted Ring Length
- ARLL Advanced Run Length Limited
- ARM Advanced RISC Machine (processor) + Annotated Reference Manual + Asynchronous Response Mode
- ARMA Association of Records Managers and Administrators
- ARP Address Resolution Protocol [Novell]
- ARPANET Advanced Research Projects Agency Network
- ARPL Adjust Requested Privilege Level
- ARS Activity Reporting System [Unisys]
- ART Adaptive Resonance Theory (algorithm)
- ARTA Apple Real Time Architecture
- ARTIC A Real-Time Interface Coprocessor [IBM]
- ARTS Asynchronous Remote Takeover Server
- .ARTS Cultural Groups (Domain Name) [Internet]
- ARTT Asynchronous Remote Takeover Terminal
- ARQ Automatic Repeat Request
- ARU Audio Response Unit
- AS Autonomous System [Internet]
- ASAI Adjunct Switch
- DHCP: Dynamic Host Configuration Protocol
- QoS: Quality Of Service
- UADSL: Universal Asymmetric Digital Subscriber Line
- JDBC: Java DataBase Connectivity
- UDDI: Universal Description, Discovery and Integration
- ODBC: Open DataBase Connectivity
- VGA: Video Graphics Adapter
- AGP: Accelerated Graphics Port
- PCI: Peripheral Component Interconnect
- VESA: Video Electronic Standard s Association
- Vfs: Virtual File System
- NFS: Network File System
- VFAT: Virtual File Allocation Table
- Voip: Voice Over Internet Protocol
- VRML: Virtual Reality Markup Language
- NAT: Network Address Translator
- NIC: Network Interface Card
- THANK U!!!!
Thursday, September 9, 2010
Types of Internet Connections
Posted by Unknown | Thursday, September 9, 2010 | Category:
computer info
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0
comments
As technology grows, so does our need for bigger, better and faster Internet connections. Over the years, the way content is presented via the Web has changed drastically. Ten years ago being able to center bold, colored text was something to admire, while today Flash, animations, online gaming, streaming video, database-driven Web sites, e-commerce and virtual offices — to name but a few — are becoming standards. The need for speed has changed the options available to consumers and businesses alike in terms of how and how fast we can connect to the Internet.
While technology changes at a rapid pace, so do Internet connections. The connection speeds listed below represent a snapshot of general average to maximum speeds at the time of publication. This is no doubt will change over time and Internet connection speeds also vary between Internet Service Providers (ISP).
Analog (up to 56k)
Also called dial-up access, it is both economical and slow. Using a modem connected to your PC, users connect to the Internet when the computer dials a phone number (which is provided by your ISP) and connects to the network. Dial-up is an analog connection because data is sent over an analog, public telephone network. The modem converts received analog data to digital and vise versa. Because dial-up access uses normal telephone lines the quality of the connection is not always good and data rates are limited.
Integrated services digital network (ISDN) is an international communications standard for sending voice, video, and data over digital telephone lines or normal telephone wires.
Broadband ISDN is similar in function to ISDN but it transfers data over fiber optic telephone lines, not normal telephone wires. SONET is the physical transport backbone of B-ISDN. Broadband ISDN has not been widely implemented.DSL
DSL is also called an always on connection because it uses existing 2-wire copper telephone line connected to the premise and will not tie up your phone as a dial-up connection does. There is no need to dial-in to your ISP as DSL is always on. The two main categories of DSL for home subscribers are called ADSL and SDSL.ADSL
ADSL is the most commonly deployed types of DSL in North America. Short for asymmetric digital subscriber line ADSL supports data rates of from 1.5 to 9 Mbps when receiving data (known as the downstream rate) and from 16 to 640 Kbps when sending data (known as the upstream rate). ADSL requires a special ADSL modem.ADSL+2
ADSL+2A is an extension to ADSL broadband technology that provides subscribers with significantly faster download speeds when compared to traditional ADSL connections. ADSL+2 works in the same fashion as ADSL a special filter is installed on a subscriber's telephone line to split existing copper telephone lines (POTS) between regular telephone (voice) and ADSL+2. ADSL2+ service is most commonly offered in highly-populated metropolitan areas and subscribers must be in close geographical locations to the provider's central office to receive ADSL2+ service.
SDSL
SDSL is still more common in Europe. Short for symmetric digital subscriber line, a technology that allows more data to be sent over existing copper telephone lines (POTS). SDSL supports data rates up to 3 Mbps. SDSL works by sending digital pulses in the high-frequency area of telephone wires and can not operate simultaneously with voice connections over the same wires. SDSL requires a special SDSL modem. SDSL is called symmetric because it supports the same data rates for upstream and downstream traffic.VDSL
Very High DSL (VDSL) is a DSL technology that offers fast data rates over relatively short distances — the shorter the distance, the faster the connection rate.
Through the use of a cable modem you can have a broadband Internet connection that is designed to operate over cable TV lines. Cable Internet works by using TV channel space for data transmission, with certain channels used for downstream transmission, and other channels for upstream transmission. Because the coaxial cable used by cable TV provides much greater bandwidth than telephone lines, a cable modem can be used to achieve extremely fast access.
A bonded T-1 is two or more T-1 lines that have been joined (bonded) together to increase bandwidth. Where a single T-1 provides approximately 1.5Mbps, two bonded T1s provide 3Mbps or 46 channels for voice or data. Two bonded T-1s allow you to use the full bandwidth of 3Mbps where two individual T-1s can still only use a maximum of 1.5Mbps at one time. To be bonded the T-1 must run into the same router at the end, meaning they must run to the same ISP.
T-3 lines are dedicated phone connections supporting data rates of about 43 to 45 Mbps. It too is a popular leased line option. A T-3 line actually consists of 672 individual channels, each of which supports 64 Kbps. T-3 lines are used mainly by Internet Service Providers (ISPs) connecting to the Internet backbone and for the backbone itself.
Short for Optical Carrier, level 3 it is used to specify the speed of fiber optic networks conforming to the SONET standard. OC3 is typically used as a fiber optic backbone for large networks with large voice, data, video, and traffic needs.
Internet over Satellite (IoS) allows a user to access the Internet via a satellite that orbits the earth. A satellite is placed at a static point above the earth's surface, in a fixed position. Because of the enormous distances signals must travel from the earth up to the satellite and back again, IoS is slightly slower than high-speed terrestrial connections over copper or fiber optic cables.
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